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<html lang="en" xmlns:th="http://www.thymeleaf.org">
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    <meta charset="UTF-8">
    <title>welcome to spring</title>
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<body>
<h1>欢迎使用spring security</h1>
<p>点击<a th:href="@{/hello}">这里</a>打个招呼</p>
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</html>